alright here is my issue i dont know how to even start this problem iam still new to vb so i need lil guidance and help in the right direction. here is the problem :

Use a one-dimensional array to solve the following problem: Read in 20 numbers, each of which is between 10 and 100, inclusive. As Each number is read, print it only if it is not a duplicate of a number already read. provide the "worst case" (in which all 20 numbers are different). use the smallest possible array to solve this problem

so any ideas to give me on how to start ?? examples ?? also forgot to mention has to display in listbox well doesnt have to butt thats what was in the orginal directions please help me with this ?? iam such a noob